Attachment for portable drills



March 24, 1931. B. E. PARK ET AL 1,797,361

ATTACHMENT FOR PORTABLE DRILLS Filed Jan. 24, 1928 2 Sheets-Sheet l Q a, b w 1% r. ski" m g a a v w l I IN: 4 W IT E v ll ill II I III Illl'lll'llllllll v it W/// A Q March 24, 1931. B. E. PARK ET AL ATTACHMENT FOR PORTABLE DRILL-5 Filed Ian. 24, 1928 2 Sheets-Sheet 2 gvvuuntor "20' Work;

. Patented Mar. 24, 1931 j snucnmrnnx, on NIH-1013s,; AND. CURTIS IVL. PARK, 01? wnvrmnxj $5133;

A TACHMENT non ron'rABLEib-Rmns;

-Ap'p1ication filedJa'nuary 24, 1925. summmm This invention relates' to attachments for portable drills and:- more particularly toa snbstitntefor the fixture ernployediwith such drills": f'or' holding work and usually desig nated'iaseo'ldmam 1 1 Anirnport'ant object oftheinvention is'to' provide device whichvis attached to and supported bythet drill Which-provides means for maintaining'the drill motor in fixedrelw in ti'ontothe Workand additionally provides means for advancing the motor toward the Work upon the: axis: of the drill.

A still furtherohject i thelnvention is to;

' produce"ardeviceof'this'character'which may ,1 be"attachedato tliedrilllnotor Without alter ing the construction at present employed therein, and whichi'may'be-employed both to advance the drillforiengagement with the work and to' withdraw the drill frointhe A/stillfurther ohject of the invention isthe production of? a: device of this character which provides an adj ustahlegauge adapted to abutthe element to-hedrilled and. fix the '25 position-of the! rill with relation to one edge thereoiti I These and other objects We" attain by the construction. shown in the accompanylng drawings- L wherein forthe purpose oi 111115? 30 trati-on i's's'hown a preferredembodiment of ourinven-tionand herein1: 1 a "Figure 1' ie a} sideelevatibn partiall-yin section showing anhattachment constructed accordance with our invention. applied to thei-drilh v, V

Figure 2 is a -longitudinal-sectional .view through the attachment; t. a j

jEigure 3is a sectionpnthe line of Finreliy igure 4 is a section on the .line of Referring-now more partieuiany to the ingof whatmayhe either an airorel'ectric drill and 11 the 'drill" spindle thereof. The eaings 'lf) o'f sn'ch devices are usually providedr about the; spindle with a projecting rupteid, asindic'atedatfltl, :mdthe gap formed.

a detail Sectional on the V drawings, the numeral indicates the cas ing' aflknurl'e'd cap (me hereinv shown Thesecit-sings ar'e furtherproazidedawithi a: handle 13 fbr conveniencerin. lldtatiliglthei casing asa aboutthe axis of: the drill. In the: present instance, 1 the; casing is: Shown: as thatfofan airunotor and? is; provided& W tbj a holding handle having theusuwla cone veniently arrangedstriggen 15 fonicontrol-ling the; flow" of air to the motor; i v In accordanceywith our invention, we: projvide a tubular housing "lfiadaptedztojfit:alionti the 'nioto'r spindle; and having at: its" end-"an: enlarged interiorilythreaded. portion 17" adapted toengage the boss 12v and; split, so: that; it may be. clamped thereon, as indicated at'18. This housing is provided; exteriorly intermediate" the I ends thereof with; a! short: left hand threaded seem 1.9. one ofithe? threads of this thread-ed section; is inter-A 75!! is? filled: by a? block: 21 of" friction" material urged outwardly by a spring? 22flsecuredi' to the wallofthe'housing and "di-pesedl in a: relcess formed therein.

i -The; numeral 23 designates: interiorlyj threaded sleeve: for engagement: .Withfthe threads '19" having at one end; an external flange 24' form'ed with ratchetteetln This sleeve'is extended through an eye 25 formed 2 upon one arm 26: of" a; U :shaped' bracket Iele meme-generally designated n21; The-cross bar ofth is' bracket'element consists oi? as tuhulai'l 'section 28 attachedto the; amr 26' and I longitudinally splitas indicated at: 29",, and a solid section: 30* adapted to :slidably engage. in the tubular portion 28 and havingaspline pin 31 adapted to: operate-in the'slot formedby the split 291 The: sectioni28'i's; eared at.

ceivethe flange 25L ofxthe sleeve 23 and the sleeve 23=hasimonntedithereon at the; opposite end thereof from this flange a collar- 34; to hold the eye against longitudinal movement 7 upon thesleevei, The; afrrr 26 hais a recess mounting rightand'; left hand ratchet e1e+ ments 35 and a coactingadjusting element 36, whereby either of these ratchet elements may be rendered inoperative or both ratchet elements permitted to simultaneously engage the teeth of the flange 24 to hold the sleeve locked with relation to the bracket. Upon the tubular housing 16 at the outer end thereof, a collar" 37"is mounted to limit outward movement of the sleeve 23 upon this housing. Inward movement thereof is limited by the enlargement 17 In the use of the device, the second arm 38 of the bracket 27 is arranged atthe opposite face of the work W from the drillD. This arm of the bracket is longitudinally slotted and has mounted thereon a work support 39 held in adjusted positions by a clamping screw 40 directed through the slot.

The Work W Which'is punch marked at the point where it'is to be drilled,is placed against the arm 38 with its lower edge above the'support 39. Thedevice is then adjusted to position the drill D in engagement with the punch mark of the work W, to position the handle 13 in an upwardly extending vertical position, and to render the righthand pawl 35 inoperative. The support 39 is then moved into contact with the lower edge of the work, and is secured in such position by its clamping screw 40. The motor is then started to effect the turning of the drill D,

and the casing lO-is then turned first to the left and then to the right by the handle 13 to efl'ect the feeding of the drill to thework. During the turning movement of the casing 10 to the left, the sleeve 23 is held against ro tation in the same direction by the left hand or active pawl 35, with theresult that the tubular housing 16 is moved forwardly and .a feeding impulse'imparted to the drill D.

During the turning of the casing 10 to the right, the friction element 21 causesthe sleeve 23 :to turn with the housing 16, with the ,result that norearward movement is imparted to the drill D and the next movement of the casing to the left will impart a further'advancing or feeding movement-to the drill. The motor turns the drill D to the right and the feeding movement of the drill is accomplished bythe left hand turning movements imparted to the easing 10.' The motor tends to turn the casing 10 to the left, and this force is utilized to assist the operator in feed ing the drill D to'the work 'After the hole 'hasbeen drilled. the left hand pawl 35 is from the work by turning the casing 10 to the work and we accordingly do not limit ourselves to such specific structure except as hereinafter claimed.

l/Ve claim 1. An attachment for motor operated drills, a member co-axial with the drill and having external screw threads, a sleeve interiorly threaded for engagement with the threads of the member, means frictionally resisting rotation of the sleeve with relation to the member when the latter is turned in one direction,a work engaging bracket having two arms one adapted to engage the opposite face of the work from the drill and the v with the drill spindle, said attachment comprising a housing having'means at one end for engaging said boss and having screwthreads upon its exterior, a sleeve having engagement with the screwthreadsof the hous ing. a U-shaped bracket one arm of which rotatablv receives the sleeve and the other arm of which is adapted to engage the work, and a ratchet connection between the last named arm and the sleeve and adapted to hold the sleeve against movement when the motor casing is turned in one direction and adapted to permit the rotation ofthe sleeve when the motorcasino; is turned in the opposite direction, and the other arm of the bracket havingan'edge guide adjustable therealong for en gagement with the'edge of the work.

3. An attachment for portable drills which include the usual motor casing and drill spindle,the'motor casing'having a boss concentric'with the drill spindle, said attachment comprising a housing having means at one end for engaging said boss and having screwthreads upon its exterior, a sleeve having engagement with the screw threads of the housing, a'U-shaped bracket one arm of which rotatably receives the sleeve and the other arm of which is adapted to engage the work, and a ratchet connection between the last named arm and the sleeve and adapted to hold the sleeve against movement when the motor casing is turned in one direction and adapted to permit the rotation of the sleeve when the motor casingisturned in the opposite direction, and the other arm of the bracket having an edge guide adjustable therealong for engagement with theedge of the work, the connection between the arms of' the bracket being adjustable as to length.

4:. An attachment for portable drills which include the usual motor casing and drill spin- 5 dle, the motor casing having a boss concentric with the. drill spindle, said attachment comprising a housing having means at one end for engaging said boss and having screwthreads upon its exterior, a sleeve having en-' gagement with the screw threads of the hous ing, a u-shaped bracket one arm of which rotatably receives the sleeve and the other arm of which is adapted to engage the work, and a ratchet connection between the last '15 named arm and the sleeve and adapted to hold the sleeve against movement when the motor casing is turned in one direction and adapted to permit the rotation of the sleeve when the motor casing is turned in the oppo- I site direction, the connection between the arms ofthe bracket being adjustable as to length.

5. Anattachm'entfor a portable drill in- V eluding a motor casing and drill spindle driven by the motor, said attachment comprising a bracket, a sleeve rotatably carried by the bracket and held against axial 'movement thereby and provided with internal screw threads, a housing adapted to be secured to the motor casing in surrounding relation to the spindle and threaded through the sleeve,

means adapted to cause the sleeve to rotate with the housing when the housing is turned in one direction, said means being carried by one of said parts and frictionally contacting with the other, and means carried, by I the bracket and adapted to hold the sleeve against rotationwhen the housing is turned in the opposite direction. e

In testimony whereof we hereunto aflix our 10 signatures." c

c v BRUCE E. PARK. CURTIS M.PARK. 

